Democrat Hillary Rodham Clinton has taken a 6.5-point lead over GOP rival Rick Lazio in their bitterly fought Senate campaign, The Post/Fox 5 tracking poll shows.

The statewide survey of 707 likely voters shows Clinton leading her Republican rival at 49.6 percent to 43.1 percent, based on growing support upstate and strong backing from Jews.

“It broke big for Clinton,” said pollster John Zogby.

The survey, conducted Tuesday through yesterday by Zogby International, has a margin of error of 3.8 percent.

It shows Clinton building on her momentum from yesterday’s poll results, which showed her edging ahead of Lazio by 46.6 percent to 46.4 percent. It was the first time Clinton took the lead since Sept. 9.

The new poll found that Clinton leads in the city – 66.8 percent to 24 percent – while Lazio is clearly ahead in the suburbs – 55 to 40.3 percent.

Lazio’s lead upstate – usually Republican territory – fell to only 6.3 points, 49.4 percent to 43.1 percent. That’s a 3-point drop from the previous day.

Clinton’s support among Jews continued to surge, rising to 69 percent from 61.5 percent a day earlier, while Lazio fell to 27.9 percent from 33.7 percent.

The Republican holds a strong edge among Catholics – 51.7 to 40.1 percent – while Clinton holds a slight lead among Protestants – 47.1 to 46.5 percent.

Zogby said Lazio has two big problems: Most of the undecideds are moving to Clinton, and the Republican’s upstate lead is too slim.

The pollster attributed Clinton’s movement to her ability to capitalize on the GOP phone calls to 500,000 voters that linked her to last month’s terror bombing of the USS Cole.

“I’ve got to think that backfired [on Lazio] upstate,” Zogby said.

“The major event over the last three days has been the rift over the phone calls.”

The latest tracking poll’s results are in line with other surveys.

A Marist College poll Wednesday gave Clinton 50 percent to Lazio’s 46 percent. Also Wednesday, a Newsday/WB11 poll showed Clinton with 48 percent and Lazio with 47 percent.